A large flightless bird of South American grasslands, resembling a small ostrich with greyish-brown plumage.
- Family Rheidae: two species, Rhea americana and Pterocnemia pennata
- He saw the common rhea - an ostrichlike bird - living in Argentina.
- The park is home to 105 species of birds ranging from condors and austral parakeets to rheas - the South American ostriches.
- For six hours we speed through sensational country, looking out for dolphins in the Straits of Magellan, and rheas, South American ostriches, as we cross the Patagonian steppe.